Thermodynamic and electron diffraction signatures of charge and spin ordering in La1 − x CaxMnO3

A. P. Ramirez, P. Schiffer, S. W. Cheong, C. H. Chen, W. Bao, T. T.M. Palstra, P. L. Gammel, D. J. Bishop, B. Zegarski

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Abstract

The large-magnetoresistance compounds La1 − x CaxMnO3 have been studied using specific heat, sound velocity(v), and electron diffraction. For 0.63n ≤ x ≤ 0.67 charge ordering is observed at 260 K and accompanied by a dramatic (> 10%) increase in v. This simultaneous occurrence of electron and lattice ordering features implies extremely strong electron-phonon coupling, known to exist for the octahederally coordinated d4 ion and originating in the Jahn-Teller effect. A dynamic manifestation of this Jahn-Teller coupling has been suggested by Millis et al. as the origin for colossal magnetoresistance.

Original languageEnglish
Pages (from-to)3188-3191
Number of pages4
JournalPhysical review letters
Volume76
Issue number17
DOIs
Publication statusPublished - 22 Apr 1996
Externally publishedYes

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